Question

Study the pedigree given below and assign the type of inheritance of the trait.

• A. X-linked recessive
• B. Y-linked
• C. autosomal recessive
• D. autosomal dominant

Answer 1

The correct option is A X-linked recessive

The given trait is X-linked recessive because it is transferred from mother to son. It is present in the homozygous dominant condition in the mother in the F1 generation, while in the 2nd son of the F2 generation, it is present in recessive condition. Same is seen with the female in the F3 generation, But in F4 generation, the first son is showing the homozygous dominant trait, thus getting affected.

So the correct option is 'X-linked recessive'.